| 摘要 |
PURPOSE:To evade the fetch of a remaining fingerprint image and at the same time to secure the safety with a fingerprint reader by inhibiting the collation of fingerprints when the irradiation of the disturbance light is detected. CONSTITUTION:A position on a light leading plate 11a containing a remaining fingerprint where a forefinger 8a is pressed is irradiated with the disturbance light having the luminous intensity higher than a prescribed level. This disturbance light is detected by a disturbance light sensor 9a and this detection signal is sent to a control part 7b. Then the part 7b sends the action commands to a read inhibiting part 15 and a reporting part 16. Thus the part 15 inhibits a photodetecting sensor 2a in regard of its photodetection. As a result, the sensor 2 never receives the reflects light of the remaining fingerprint on the plate 11a even if the reflected light reaches the sensor 2. The part 16 actuates a buzzer 41 to report the detection of the disturbance light. Thus it is possible to prevent the collation of remaining fingerprints. |
